Invisible scar endoscopic dorsal approach thyroidectomy: a clinical feasibility study.

BACKGROUND: The aim of the present study was to test the safety and feasibility of the dorsal approach endoscopic thyroidectomy procedure in a prospective trial in humans, after the procedure had been developed ex vivo in human cadavers. METHODS: A total of 28 patients were enrolled for 30 unilateral procedures of thyroidectomy. Two cases were staged bilateral procedures. Patients presenting with suspicious cold nodules, hot nodules, or goiters were operated on under general anaesthesia. Skin incision is carried out on the scalp, behind the ear. Deep to the sternocleidomastoid muscle, but respecting the superficial cervical fascia, the preparation goes past the carotid triangle to reach the thyroid below the straight neck muscles. Postoperatively the patients underwent neurological assessment, vocal cord examination, clinical control for hemorrhage, and determination of serum levels of Ca(2+). RESULTS: Thirty unilateral procedures by the dorsal approach were carried out in 22 women and 6 men. There was 1 subtotal thyroidectomy and 29 total unilateral thyroidectomies with no conversions. There was one permanent recurrent laryngeal nerve (RLN) lesion and one postoperative hemorrhage. The size of the lobes removed ranged from 6 to 40 ml (mean: 18 ml). In four cases the specimen exceeded 38 ml. There was one multifocal papillary cancer requiring open surgical revision and lymphadenectomy. The other diagnoses were benign. All wounds healed by primary intention. Temporary impairment of cervical nerves was detected in six patients. It was possible to avoid access-related problems by improving the patient's positioning on the operating table, omitting straight instruments, and respecting the superficial fascia before entering the carotid triangle. CONCLUSIONS: Hemithyroidectomy by the dorsal approach is feasible. It is a single surgeon, single port, gasless unilateral endoscopic technique with the option to go bilateral.

Invisible scar endoscopic thyroidectomy by the dorsal approach: experimental development of a new technique with human cadavers and preliminary clinical results.

BACKGROUND: A unilateral gasless single-surgeon videoendoscopic thyroidectomy procedure using a dorsal cephalic approach from the scalp with the option for a bilateral approach was developed with human cadavers and a porcine model for access training. The final preclinical trials and the first three clinical cases are described in detail. METHODS: Preclinical evaluation and training for the procedure were conducted with fresh human cadavers. The procedure was defined precisely by a sequence of nodal points initiating surgical steps. A quality score was developed by issuing each important anatomic structure a specific organ value and a factor for positive identification, inability to identify a given anatomic structure, spare it (meaning omit causing a lesion) or injure the structure. The quality of each operation was expressed as a single number or quality score value, calculated by summing the points achieved for the individual anatomic structures. The results of the procedures were controlled by prospective video documentation and autopsy. After conclusion of the preclinical training, the operation was performed for patients. The reported patients are part of a feasibility study approved by the institutional review board of the University of Munich. RESULTS: Nodal points were helpful in preparation for the operation by mental training. During the procedure, they helped to guide the preparation in the neck, where the working space must first be created on the way to the target organ. The surgical quality score improved over the first three cases and reached the maximum score, which was reproducible every time after that. It showed that the dorsal approach from the scalp to the thyroid gland is easily achievable without complications. The technical challenge is exposure of the recurrent laryngeal nerve (RLN) and the parathyroid glands. There was no difference between the results achieved by the resident and the senior surgeon. Preclinical training was good preparation for hemithyroidectomy in patients. All cases could be managed without postoperative hemorrhage or impairment of the parathyroid or the RLN. CONCLUSIONS: Videoendoscopic thyroidectomy by the dorsal approach is feasible in both human cadavers and patients. It leaves no visible scars. Nodal points are helpful for executing a new operation. The surgical quality score is a complex and objective measure of ability to deal with the procedure. Further clinical studies are required for evaluation of this new procedure.